336 DIPTERA OF NORTH AMERICA. [PART IV. 



cus, elongatus ; basis articulorum sequentium multo breviorum, pilis 

 verticillatis. 



Pedes longissinii. 



Habitus Limnobice. Nomen a vo\vq, multum, et /asm, part. 



[Tranlsation. — Antennae 28-jointed; first joint globose, the second cylin- 

 drical, elongated ; the following joints much shorter, with verticillate hairs 

 at their basis. Feet very long. Appearance of a Limnobia ; the name, etc.] 



Two species from South America are described ; they are 3 

 and 3J lines long ; one is black, with brown wings, banded with 

 white, the other brown, with hyaline wings. Wiedemann's figure 

 (1. c. Tab. YI, b, fig. 4) represents a venation not unlike that 

 of Bhaphidolabis, only all the cells in the apical portion of the 

 wing are exceedingly long, the small and the great cross-veins, 

 as well as the inner end of the discal cell, being before the middle 

 of the length of the wing. 



Macquart (Dipt. Exot. I, p. 64) gives a description and a figure 

 of Polymera fusca Wied. To the generic characters he adds 

 that the rostrum is very short ; the palpi of equal length, the last 

 joint slender, pointed ; collare indistinct ; feet slender ; tibiae 

 with spurs at the tip ; tarsi longer than the tibiae. Wings with 

 pubescent veins. Abdomen of the male flattened, with an elon- 

 gated forceps. 



Macquart's figure (1. c. Tab. VIH, fig. 1) shows a distinct thora- 

 cic suture and a venation similar to that figured by Wiedemann. 

 As this insect has five posterior cells and spurs at the tip of .the 

 tibiae, if it fits in any of our sections at all, it must belong either 

 to the Limnophilina or to the Amalopina. The venation, especi- 

 ally the absence of a discal cell, reminds us of the Amalopina. But 

 the male forceps, consisting, if Macquart represents it correctly, 

 of two elongated slender halves, leaving an empty space between 

 them, is very different from the forceps of the Amalopina. The 

 presence of spurs on the tibiae of Polymera excludes the proba- 

 bility of its relationship to the Eriopterina. 



